APV SD4 double sealed valve

Flow-through single-seat valve with double seal, for safe separation of incompatible media in the food production pipeline. The models are equipped with drive and control unit to turn on and maintain high pressure in line.

Brief characteristics

Type: piston with pneumatic drive
Types: anti-mixing, shut-off, switching flow, outlet from the tank, aseptic
Dimensions: ISO 1” -4” external. Ø pipes, DIN DN25-100
Material in contact with the product — AISI 316L / 1.4404 steel
Pressure: 10 bar. Temperature up to +140°C

The lineup: TD4 and SD4 (standard rack version), SD4 (long stroke), SDMC4 (aseptic version with PTFE membrane), SDU4 (switching version), SDT4 (drain valve)

Component design

Double Seat Valve Schematic

Control unit
Pneumatic actuator
Yoke
Double set seals
Leakage/CIP discharge valves

Cleaning the valve chamber Cleaning of the leakage chamber is undertaken via the leakage valves. The cleaning liquid is supplied via one leakage valve and discharged to the atmosphere via the second one. The directed flow of the cleaning liquid provides for a perfect cleaning of the whole leakage chamber.

CIP in
CIP out

Features

One shaft design with two seals and cavity between them. Forms a seat-to-seat space for safe separation.
If the seat seal is damaged, leakage will flow through the valves into the drain.
The seat space is closed or opened beyond the line by two leakage relief valves.
Used to connect the CIP feed to the product processing line and to connect the outlet to the CIP return line.

Operation

Seat valve operating principle

Aseptic valve design

Leak detector
TFM membrane with rubber support
Spherical body
Leakage relief valves
Seat-to-seat space (drainage)
Seat seals

Aseptic Valve Schematic

Key Benefits of SD4 series

Excellent hygienic characteristics due crevice-free sealing. Safe incompatible media separation.
Quick and easy service of the valve. Flanged valve body closure for safe and controlled disassembly and assembly of valve insert.
Ball-shaped housing without sump or dome.
Sealings with metallic stop ensure limited elastomer compression and, consequently, avoidance of sealing overstress. Clear identification markings ensure prompt and fail-safe identification of seals during maintenance.
Controlled by a single solenoid valve, so no additional control is required.

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